Chapter 13 - Mesoglea = middle jellylike layer Phylum...

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CHAPTER 13 RADIATE ANIMALS
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Outline Phylum Cnidaria General characteristics Class Hydrozoa Class Scyphozoa Class Cubozoa Class Anthazoa
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Phylum Cnidaria General characteristics Radial symmetry No organs Diploblastic Tentacles Polyp and medusa forms
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Figure 13.02
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Phylum Cnidaria General characteristics Most marine, some freshwater Incomplete gut Nematocysts = stinging organelles Cnidocytes = holds nematocysts Nerve net
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Phylum Cnidaria General characteristics Muscles = Longitudinal and circular Reproduction asexual and sexual No coelom
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Radiata Digestion Extracellular digestion = outside cells - Gastrovascular cavity Intracellular digestion = inside cells
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Radiata Nerve cells Statocysts = balance Ocelli = eyespot
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Phylum Cnidaria Body plan Polyp - Develops from planula - Asexual reproduction - Some colonial
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Phylum Cnidaria Body plan Medusa - Develops by strobilation - Dioecious
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Phylum Cnidaria Body wall Epidermis = outside layer Gastrodermis = lines digestive cavity
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Unformatted text preview: Mesoglea = middle jellylike layer Phylum Cnidaria • Class Hydrozoa Both polyp and medusa stages Hydra-Polyp-Colonies Obelia Figure 13.07 Phylum Cnidaria • Class Scyphozoa Large jellyfish Open sea Bell-shaped Polyp stage reduced Phylum Cnidaria • Class Scyphozoa Dioecious Internal fertilization Aurelia Cassiopeia Figure 13.17 Phylum Cnidaria • Class Cubozoa Polyp reduced or absent Sea wasp/cube jelly Phylum Cnidaria • Class Anthazoa No medusa stage Some colonial Marine Sea anemones Corals Figure 13.21 Figure 13.27 Phylum Cnidaria • Class Anthazoa Coral reefs-Characteristics Algae-Types Fringing Barrier Atoll Review • Phylum Cnidaria General characteristics Class Hydrozoa Class Scyphozoa Class Cubozoa Class Anthazoa Reminders • Read Chapter 13 • Lab Exam 2 • Exam 4...
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Chapter 13 - Mesoglea = middle jellylike layer Phylum...

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